you mean just change what your processor's called? well you can edit the name by typing regedit, then goto hkey_local_machine. then hardware/description/system/central processor. here's an example..lol i did this on win98, so im not sure if it works on xp or not. it also resets the name everytime you restart your computer
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Primary rig: AMD Athlon 64 3700 (2.2 Ghz) San Diego core|2 GB Corsair DDR 400 ram|ASUS A8N-SLI Deluxe mobo|512 MB eVGA GeForce 7950GT|Primary HD: 300 GB Maxtor| Secondary HD 200 GB Western Digital HD|Aspire X-Dreamer II case w/550w Antec PSU|Sony DVD-Rom|Sony DVD-RW|19" Sceptre LCD|4.1 Surround Sound|Runnin on Windows XP Pro SP2